DC-DC converter, chip and electronic device

Abstract

Provided in the present disclosure are a DC-DC converter, a chip and an electronic device. The DC-DC converter comprises a bootstrap boost circuit, a charge pump boost circuit, a high-side drive circuit, a low-side drive circuit, a high-side power transistor and a low-side power transistor; the bootstrap boost circuit provides a first boost voltage for the high-side drive circuit; on the basis of the first boost voltage, the high-side drive circuit outputs a first high-side drive voltage to a control electrode of the high-side power transistor; the charge pump boost circuit generates a second boost voltage by means of a charge pump and, on the basis of the second boost voltage, outputs a second high-side drive voltage to the control electrode of the high-side power transistor, the second boost voltage being greater than the first boost voltage; a first electrode of the high-side power transistor is coupled to an input voltage terminal, while a second electrode thereof is coupled to a first electrode of the low-side power transistor by means of a switch node; the high-side power transistor is turned on or off on the basis of the first high-side drive voltage and the second high-side drive voltage; one end of the bootstrap boost circuit and one end of the charge pump booster circuit are both coupled to the switch node.

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